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MN1240 Installation 2-7

Speed and Torque

The speed−torque curves for a motor show the safe operating area, speed

limit area and intermittent operating area. These curves are used to

determine the maximum useable speeds with known torque requirements.

If operating within the continuous area, the motor’s thermal limit will not be

exceeded. If operated within the intermittent area (extended operation in this

area will cause the motor to overheat), the operating time in this area must be

limited to prevent overheating.

Brushless servo motors are rated at an ambient of 25 degrees C and a

temperature rise of 130 degrees C. For operation at 40 degrees C derate by 6%.

WARNING: Severe burn is possible. The motor winding can reach 155 degrees C

during operation. Do not touch motor without protective clothing or

allow sufficient time for motor to cool to avoid burns.

Figure 2-5 Typical Speed−Torque Curve

Peak current

capability of the motor

Continuous current

required by the application

Required speed for

the application

Maximum Motor Speed Capability

Continuous Torque at speed

for the application

Intermittent Area

Continuous Area

Holding Brake

Holding brakes are offered as options for servo motors. These brakes are

designed to hold the motor shaft at 0 RPM (to rated brake holding torque).

The purpose of the holding brake is to hold the servo axis when power to the

machine is turned off. The holding brake uses the “electric release” principle.

Apply 24VDC to the brake causes the brake to release and let the motor shaft

rotate. Loss of power causes the brake to hold the motor shaft.

The machine controller controls the holding brake. This ensures correct On

and Off switching sequence.

WARNING: The holding brake alone does not guarantee personnel safety. Use

structural measures such as protective fences or a second brake to

secure personnel safety.

Caution: Do not use the holding brake to stop motion. This will cause premature

brake wear and failure. The brakes are not designed to stop a rotating

load. The servo drive inputs should always be used to stop motor shaft

rotation.

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